Footage from the search operation at Grenfell Tower shows the burnt out stairwell of the building where at least 80 people were killed four weeks ago today.

The video was released as police working at the building described the terrible lengths officers have to go to to find out who died in the building on June 14.

The footage shows the narrow stairway where many lost their lives as they tried to escape the inferno which engulfed the 24-storey building in under 30 minutes.

Police have released a video showing conditions inside the burnt out Grenfell Tower

The blackened stairwell in the tower is where many tragically lost their lives in the blaze

Sergeant Alistair Hutchins, who was one of the first officers from the Disaster Victim Identification Unit to enter the block, said: 'We are looking at a fingertip search, of all flats on all floors.'

He said officers were working on their hands and knees with trowels as they try to find fragments of bones and teeth in the devastated flats.

He said: 'They will be removing debris from those flats using sieves. All the debris from that flat is then packaged and is kept to one side and is marked with the floor number and the flat number so we identify those bags.'

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The specialist officer also acknowledged the frustration that families of the victims are experiencing due to lack of information available, adding: 'I deeply, deeply understand the frustration family members have and the answers they want.

'All I can say is please be patient, we are doing our utmost best for you. And we are working as hard as we can.'

A police officer called to the scene on the night of the fire said it reminded him of 9/11.

Sergeant Nick Thatcher said: 'I honestly thought on the night every second "This is going to come down". I even thought when I left it was going to come down.'

Firefighters had to shore-up many of the flats due to fears they could collapse on investigators

The police officer leading the investigation said that police are determined to return those who died to their families.

Commander Stuart Cundy said the human cost of that blaze 'is something we are all still trying to fully comprehend'.

He added: 'Each and every one of us involved from the Met is determined to do all we can to return those who died to their families as soon as we can.

'Today, we remember all those who have been so deeply affected.'

A vigil will be held this evening in the shadow of the block's blackened shell, the first of several commemorations expected as the one-month anniversary approaches.

Mourners will gather around a wall of handwritten tributes which sprung up after the fire and has since sprawled around several streets in the west London neighbourhood.

Pictures previously released by investigators showed the devastation inside the building

One focus of the investigations into the blaze will be whether cladding helped the fire spread

Inquests will be opened today for more of the victims at Westminster Coroner's Court.

The fallout from the disaster has been wide-reaching, with hundreds of families displaced, a clutch of local politicians resigning and tensions heightening between residents and the authorities.

Those affected by the tragedy have been granted additional time to make their case about which issues a public inquiry will consider.

The blaze which killed at least 80 people ripped through the block four weeks ago today

Campaigners had warned they were prepared to abandon the forthcoming probe unless it was broadened to consider systemic problems alongside the immediate causes.

An inquiry spokesman confirmed on Tuesday that the deadline for consultation on its terms of reference would be extended until July 28.

He said: 'Since the announcement of Sir Martin Moore-Bick as chair of the Grenfell Tower public inquiry, he and his team have held discussions with many interested parties, in particular survivors of the fire and other residents of the Lancaster West estate.

'It has become clear from these that there is a broad consensus that those affected need more than the one week originally envisaged for the inquiry's consultation on its terms of reference.'

The spokesman added: 'We are therefore extending the consultation period until 28 July, an extension of two weeks.

'We believe this strikes the right balance between providing enough time for people to respond meaningfully and ensuring the inquiry's work, which cannot begin without terms of reference, can progress quickly.'

A nationwide safety operation is in full swing to establish how many other high-rise buildings were encased in flammable cladding, which is blamed for the blaze's spread in Grenfell Tower.

The Department for Communities and Local Government said in an update that 211 buildings across 55 local authority areas used material that failed its fire safety tests.

Victims of the Grenfell Tower blaze were aged from six months to 84

FLOOR 23

Rania Ibrham lived on the 23rd floor

Rania Ibrham and children

Believed to be a mother of two small children - Fathia and Hania - Rania Ibrham, 30, uploaded a harrowing Facebook Live video as she appeared to be stuck at the top of the tower block, and has not been heard from since.

In the footage, she can be seen seeking help in the smoke-covered corridor of the block before going back into her home and looking down on the street below from her balcony.

A friend, named only as Maseen, told the MailOnline her friend 'lives on the top floor with her two children who are just three and five years old.'

'I received a Snapchat video from Ranya at 3am just after the fire started and I haven't heard from her since,' she added.

'She lives on the top floor and her husband was not home because he is on holiday.'

Gloria Trevisan and Marco Gottardi

Gloria Trevisan and Marco Gottardi

The young Italian couple recently moved into the 23rd floor of Grenfell Tower.

Friends and family have appealed for information online after last hearing from the couple early on Wednesday morning.

Ms Trevisan, 26, called her mother in Italy at roughly 3.30am on Wednesday to say their building was ablaze, according to the Italian newspaper Corriere del Veneto.

The pair have both been confirmed as dead by authorities.

Fathiya Alsanousi and children

Fathiya Alsanousi, believed to be in her 70s, has not been seen since before the fire broke out. Abufars Ibrahim, 39, believed to be her son, has been confirmed dead by police after suffering multiple injuries, while her daughter, Esra Ibrahim, 35, remains missing.

'Our family loves her so much,' he said. 'She's very fun to be with despite her age. So innocent yet very straightforward. She's been in London for a very long time, she visits us here in the Philippines once in a while.'

FLOOR 20

Khadija Saye and Mary Mendy

Artist Khadija Saye, also known as Ya-Haddy Sisi Saye, died in the hallway on the ninth floor as a result of inhalation of fire fumes and burns.

She was hailed as a 'wonderful young woman' by Tottenham MP David Lammy, and was due to appear on a BBC documentary about her work, which was on show in Venice as part of a collection on the theme of diaspora.

Ms Saye's mother, Mary Mendy, is thought to have been visiting her daughter on the 20th floor of Grenfell Tower when the fire broke out. She died on the 13th floor, an inquest heard.

Khadija Saye and her mother, Mary Mendy, were in Ms Saye's flat on the 20th floor

Jessica Urbano

Jessica Urbano is still missing following the fire at the block.

Last week, her family and friends celebrated what would have been the schoolgirl's 13th birthday at a gathering in Avondale Park, west London.

Her Aunt Ana Ospina told the Press Association shortly after the fire took place: 'She last spoke to her mum when she borrowed a phone and told her she was on the stairs with other people.'

Hesham Rahman

Hesham Rahman, 57, is said to have last made contact with his family at around 3am when he told them he could smell smoke. He has not been heard from since.

It was also reported that Mr Rahman has diabetes, making it difficult for him to walk down stairs.

Jessica Urbano and Hesham Rahman are also feared to have died in the blaze

The Belkadi family

Four members of a family of five were killed in the blaze at Grenfell Tower, with the fifth - a young child - taken to hospital.

Mother Farah Hamdan, 31, and her husband Omar Belkadi, 32, lived on the 20th floor of Grenfell Tower with their daughters Malek, seven, Tazmin, six, and Leena, just six months old.

Leena Belkadi and her sister Malak both died from inhalation of fumes during the blaze. Their mother and father also died in the blaze, with the youngest child found in her mother's arms between the 19th and 20th floors of the building.

Malak was recovered from the 20th floor and died later at St Mary's Hospital, where she was taken alongside her sister Tazmin.

A young family who reportedly lived on the 20th floor of Grenfell Tower are also among the missing.

Posters placed in the area appeal for information about two of the children, Yahya and Firdous, believed to be 13 and 11.

But reports from friends in the area and from family on social media suggest parents Nura Jamal and Hashim Kadir, as well as youngest child Yaqub, are all still missing.

Sean Mendez, 36, who runs Solidarity Sports, told the Mirror: 'I have known the children and the family for more than four years, both kids really enjoyed football and were both really intelligent and articulate.'

The body of Mohamednur Tuccu, 44, was recovered from close to the nearby leisure centre.

He had been reported missing alongside his wife Amalahmedin and his three-year-old daughter after visiting relatives in Grenfell Tower, his employer previously said.

FLOOR 18

Berkti and Biruk Haftom

Police have confirmed that Berkti Haftom, 29, died in the fire at Grenfell Tower after she was formally identified. Her son Biruk, 12, has not been seen since the disaster took place.

Berkti and her son Biruk Haftom (left) and Sakineh and Fatima Afraseiabi (right)

Sakineh and Fatima Afraseiabi

Sakineh Afraseiabi, 65, and her younger sister Fatima (age unknown) were on the 18th floor of the building and have not been seen since.

The Iranian family of the pair, who are presumed to have died, told the Guardian that Sakineh was disabled and only able to move with a walking stick.

She said: 'She was forced to live there because she had no other option. On a good day she couldn't come down 18 floors - but in the fire and smoke?'

Five-year-old Isaac Paulos is one of the youngest victims of the blaze

Isaac Paulos

Five-year old Isaac Paulos was last seen escaping the blaze with neighbours and family, but reportedly got lost in the smoke.

The boy, who vanished in the dense fumes as his family attempted to escape the blaze, choked to death on fumes from the fire and was found on the 13th floor of the building.

In a statement released by the Metropolitan Police, his family said: 'Isaac our beloved son was taken from us when he was only five years old.

'We will all miss our kind, energetic, generous little boy. He was such a good boy who was loved by his friends and family.

'We will miss him forever, but we know God is looking after him now and that he is safe in heaven.'

FLOOR 17

Khadija Khalloufi was confirmed dead

Khadija Khalloufi

Fifty-two-year-old Khadija Khalloufi died from inhalation of fumes, an inquest heard. She leaves behind husband Sabah Abdullah, who was granted an emergency passport to attend her funeral in Morocco, after his identification was lost in the fire.

'I'm relieved now. At least I know I'm going to fulfil the wish of my late wife,' he told the BBC after the broadcaster appealed to the Home Office on his behalf.

Vincent Chiejina

Vincent Chiejina, 60, was recovered from the 17th floor of the building and identified by DNA, his inquest heard.

The coroner's officer said the provisional cause of death had been given as 'consistent with the effects of fire'.

Rabeya and her daughter Husna Begum

The Begum family

Two members of a family of five who lived on the 17th floor are confirmed to have died.

Rabeya Begum, 64, and Husna Begum, 22, were both found on the 17th floor of the building and died from injuries 'consistent with the effects of fire', their inquests heard.

It is not yet clear what happened to the other three members of the family - reported to be Komru Miah, 82, Abdul Hanif, 29, and Abdul Hamid, 26.

FLOOR 16

Deborah Lamprell

Deborah Lamprell is presumed dead

Deborah, or Debbie, Lamprell, 45, worked front of house at Opera Holland Park and is presumed to have died in the disaster.

In honour of their colleague, the opera house in west London held a special encore at a recent performance, before which a private memorial service was held for around 100 people - including family and performers at the venue.

Michael Volpe, general director at the company, said she had worked for them for 'several years' and called her 'a really valued member of staff', adding: 'She will be remembered here.'

'Part of her job was to go backstage and check things backstage. Not only was she known to all of our patrons, she was really popular with all the singers, chorus and the orchestra and she had a lovely way about her.'

Marjorie Vital, 67, and her son Ernie, 43, lived on the 16th floor

Marjorie and Ernie Vital

Marjorie Vital, 67, and her son Ernie, 43, lived on the 16th floor of Grenfell Tower.

Friends and family members put posters up around the area appealing for information. They have still not been seen since the fire broke out.

Sheila, formerly Sheila Smith, is one of the eldest victims

Sheila

Sheila, 84 - formerly known as Sheila Smith - lived on the 16th floor of Grenfell Tower, where she died with injuries 'consistent with the effects of fire', an inquest heard.

A friend, Gary Allen, said he had known her for 20 years, and described her as a 'truly beautiful person' and 'love, pure and simple'.

'We shared a great interest in history, Shakespeare, the Knights Templar, etcetera and she had a great spirituality about her,' he said.

FLOOR 15

Hamid Kani

Sixty-one year-old Hamid Kani lived on the 15th floor, according to family, but has no relatives in the the UK. He does not appear to have been found.

'All members of his family are here in Iran,' Mr Kani's niece, Maryam Shahvarani, told the Press Association. 'They are worried to death about him.'

She said he lived alone, struggled with hearing problems and wore hearing aids.

'Please someone help us to have just a little information about his destiny,' she added.

Neither Hamid Kani (left) nor Steve Power (right) have been missing since the fire

Steve Power

Steve Power, thought to be aged 63, reportedly lived on the 15th floor of the tower. Several family members have posted online speaking of their heartbreak at not being able to find him.

FLOOR 14

Syrian refugee Mohammed Al Haj Ali

Mohammed Al Haj Ali

Twenty-three-year-old Syrian refugee Mohammed Al Haj Ali was the first fatality from the disaster to be formally identified by police. Having reportedly been stuck in his flat on the 14th floor for two hours, he was later found outside the tower block having fallen from the burning building.

His funeral was held a week after the disaster and was attended by his family, some of whom came over from Syria, and mayor of London Sadiq Khan.

A family statement read at the service said he 'loved London and loved the people he met here', and had begun pursuing his dream of studying engineering.

'He was a loving and caring person, always showing support and solidarity for friends and family stuck back in Syria.'

Dennis Murphy was trapped on the 14th floor of the building, his family said

Dennis Murphy

Stevan Racz, shared a post seeking information about his uncle Dennis Murphy, who he said had called while trapped on the 14th floor of the building.

Mr Racz has since posted that he had been told Mr Murphy had 'passed' in the blaze, though this has not been confirmed by authorities.

Zainab and Jeremiah Dean

Zainab Dean was in her flat with her two-year-old son Jeremiah when the fire broke out. They have not been found since.

Originally from Sierra Leone, Ms Dean was described as a 'beautiful, loving lady' when a group of friends gathered near Grenfell Tower to pay tribute to her.

Isha Thomas, a friend of Ms Dean, said she believed the 28-year-old was following advice not to leave the building, adding: 'She was on the phone to her brother until four in the morning.'

She added: 'We are just devastated. I just want them (authorities) to answer. We need answers, we need to know what happened.'

Zainab Dean was in her flat with her two-year-old son Jeremiah

FLOOR 11

Abdeslam Sebbar

Abdeslam Sebbar, 67, is thought to have lived on the 11th floor of Grenfell Tower, where he was discovered. He died from an inhalation of fire fumes, an inquest heard.

FLOOR 10

Ali Yawar Jafari

Ali Yawar Jafari, 81, was pulled from Grenfell Tower by firefighters but was pronounced dead at the scene due to inhalation of fire fumes, his inquest heard.

His son, Hamid Ali Jafari, said his father had lost contact with his mother and sister, who lived with him in Grenfell Tower, on the 10th floor.